My b&k 466 will show mid to upper bad on monochrome CRTs that produce reasonably bright pictures on a healthy chassis.... Cutoff is only important on color CRTs...As long as you don't get all or nothing cutoff response adjusting the knob( that indicates gas).
The good bad scale is accurate for color CRTs where a good portion of the emission is lost at the shadow mask before it can reach the phosphor.
If it is somehow dim with the chassis working right just throw a brighter on it.
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